package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /**
     * 开始的时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1735689600L;//2025/1/1 0:0:0的秒数

    /**
     * 序列号位数
     */
    private static final int COUNT_BITS = 32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2.自增长序列号
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //3.拼接并返回
        return timestamp << COUNT_BITS | count; // timestamp左移32位，拼接count
    }

   /* public static void main(String[] args) {
        LocalDateTime of = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
        long time = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println("2025/1/1 0:0:0的秒数："+time);//1735689600

    }*/

}


